package com.heima.app.geteway.filter;

import com.heima.app.geteway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @Author 王某鑫
 * @Date 2025/1/2 14:15
 */
@Component
@Slf4j
public class AuthorizeFilter  implements Ordered, GlobalFilter {
    /**
     * 过滤的方法
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();


        //2.判断是否是登录
        //直接判断请求的路径是不是login
        if (request.getURI().getPath().contains("/login")){
            //如果是登录的请求那么就放行
            return chain.filter(exchange);
        }

        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if (token == null || token.isEmpty()){
            //UNAUTHORIZED结束请求并且返给前端一个401代码
           response.setStatusCode(HttpStatus.UNAUTHORIZED);
           return response.setComplete();
        }
        //5.判断token是否有效
        //获取token
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //查看token是否有效  -1：有效，0：有效，1：过期，2：过期
            int res = AppJwtUtil.verifyToken(claimsBody);
            //过期
            if (res == 1 || res == 2){
                //UNAUTHORIZED结束请求并且返给前端一个401代码
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

        } catch (Exception e){
            //如果解析出问题，那这边也返回401
        e.printStackTrace();
            //UNAUTHORIZED结束请求并且返给前端一个401代码
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行

        return chain.filter(exchange);
    }

    /**
     * 优先级设置 值越小 优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
